[cisco-voip] Modem Passthrough: Clocking Issue

[Matthew Saskin]

Quick guess is that both your PBX and your router are set to either 
clock internally or from the line (the problem being they are both set 
the same).  You need to make sure they are synced to one another, such 
that one provides clock (clock source internal on a cisco router) and 
one receives clock (clock source line on a cisco router)

-matt

Ramiz Sardar wrote:
> Friends,
>
> I am working on voip setup where i am trying to configure modem 
> passthrough but i am encountering slips issue. My topology you can see 
> below:
>
> RAS----PBX1----Router1--------Router2-----PBX2-----Dialup User
>
> Note: RAS is connected with PBX1 via PRI, PBXs with routers(c3800) via 
> E1 PRI (Qsig). Routers are connected back-to-back via E1. All devices 
> are in same testing lab.
>
> when dialup user try tot connect with RAS, modem keeps negotiating and 
> not gets connected. Something it gets connected but after a while gets 
> disconnect.
> I diagnose the problem, that is not because wrong configuration but it 
> is due to clocking missmatch between Routers and PBXs. Thats why when 
> i run command "show controller e1 0/0/0", i find slips there.
> Please someone suggest me how to get this issue resolved. And also 
> tell me the best prectice regarding clocking for the topology above.
>
> Waiting For your positive immediate response.....
>
> Best Regards
>
> Rameez
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